重庆电网主网电压及无功优化问题分析

针对重庆电网主网220kV在枯水期低谷时段无功过剩，系统电压偏高的状况，通过计算、分析等手段对系统电网电压和无功进行全面的分析研究，提出解决方案，使重庆220kV电网低谷电压控制在232kV以下。构建重庆电网主网计算等值模型，以有功网损最小为目标函数，对重庆电网进行无功优化计算，提出各种优化补偿方案，通过计算结果综合分析各方案，从中得出合理可行的最优方案，并论证了发电机进相运行调控系统电压的可行性。通过对重庆电厂发电机的进相运行，降低了系统电压，改善了重庆电网运行性能，加强了系统协调稳定。

Voltage and Reactive Power Optimization of Main Electric Power Network in Chongqing

Based on the reactive surplus of Chongqing 220 kV main electric power network under low water and low load, and on state of higher system voltage, a thorough research is done on voltage and reactive power of the system power network by means of calculation,analysis and experiments. A main network calculating equivalence model of power network in Chongqing is constructed. And reactive power optimizing calculation is figured out on the Chongqing power network on condition that the loss minimum of the active power network is object function. Several optimizing compensatory schemes are put forward. Based on the calculation result and the analysis of all schemes, the most reasonable and feasible optimizing scheme could be achieved. Meanwhile, the feasibility that the system voltage could be adjusted when generator operating under excitation was demonstrated. According to the experience of under-excitation operation of the same type units , it decreases the system voltage, improves Chongqing power network running performance, and strengthens the coordination and stabilization of system.